Features 1、These casters are designed with the universal standard size stem, so you can transform any task chairs or stools that roll into modern, striking furniture. 2、Each caster is constructed of high quality PU which withstand a load up to 50kg. 3、The caster is very smooth, easy to move and roll. 4、A good replacement for your chair or other furniture which can make your life easier. 5、Convenient to use, wheels can easily be installed without tools or hardware. Specification Features: These casters are designed with the universal standard size stem, so you can transform any task chairs or stools that roll into modern, striking furniture. Each caster is constructed of high quality PU which withstand a load up to 50kg. The caster is very smooth, easy to move and roll. A good replacement for your chair or other furniture which can make your life easier. Convenient to use, wheels can easily be installed without tools or hardware. Specification: Material: PU Weight: Approx.535g~1360g / 18.9oz~48oz Diameter: Approx.75mm/ 3in Mounting Height: Approx. 90mm/ 3.54inch Load Capacity: Approx.50Kg Quantity: 5Pcs Type: #1,electrocoating with circlip/ #2,electrocoating with screw rod/ #3,galvanizing with circlip/ #4,PU single wheel (Optional) Size:(#1,#3) Approx. 11 x 22mm/0.43 x 0.87inch (#2) Approx. 8 x 17mm/0.31 x 0.67inch Package List: 5 x Casters Note: 1. Please allow slight measuring deviation due to manual measurement. 2. Please confirm that your requirements are consistent with our product size description before ordering. Package List